PK-232 MBX – OPERATING MANUAL BAUDOT AND ASCII OPERATION
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6.2.3 Tuning in Baudot and ASCII Stations
Tuning in Baudot and ASCII stations properly is critical to successful operation. Since HF
Baudot and RTTY stations use either 170 Hz or 200 Hz Frequency Shift Keying to send da-
ta, tuning accuracy is very important. Follow the tuning procedure below carefully for the
best results in tuning HF Baudot and ASCII stations.
o Make certain your HF receiver is either in LSB or FSK depending on your PK-232 set-
up.
o Turn any IF-Shift and Passband-Tuning controls to the Center or OFF position.
o Tune your receiver carefully between 14.08 and 14.10 MHz (or another band where
you know there is Baudot or ASCII activity) and listen for RTTY stations.
o When you find a station, slowly vary VFO tuning knob on your receiver and look for
a display on the PK-232 tuning indicator like the one shown below.
Tuned In
If the tuning indicator looks like the one below, the frequency from your speaker is
too low for the PK-232 to copy packets. Slowly tune the VFO and make the fre-
quency higher.
Frequency Too Low
If the tuning indicator looks like the one below, the frequency from your speaker is
too high for the PK-232 to copy packets. Slowly tune the VFO and make the fre-
quency lower.
Frequency Too High
o Adjust the PK-232's THRESHOLD control so that the DCD LED lights when a properly
tuned RTTY station is being received.
HINT: If you adjust the THRESHOLD control so the DCD LED goes out when
no station is being received, you will prevent garbage characters gen-
erated by noise from printing on your screen.
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